1·We have already seen a demonstration in class whereby we converted mechanical energy when someone was rotating, into electric energy.
课堂上我们已经看到,怎样在物体旋转时,将机械能,转化成电能的，演示例子。
2·When people open or close a door, the door produces mechanical energy that could be turned into electric energy.
人们开关门时，门所产生的机械能可转化成为电能。
3·Power system state estimation is the core of electric energy management system and the bases of dispatch, control, security evaluation and so on.
电力系统状态估计是电力系统调度、控制、安全评估等方面的基础，也是电能管理系统的核心组成部分。
4·We will try to give cheap electric energy and heat to every inhabitant of the world.
我们努力向全世界每位居民提供廉价的电能和热能。
5·Until fairly recently, the only way to extract pure copper from ore was by using a process that requires large amounts of electric energy, especially if the proportion of copper in the ore is low.
直到最近，从矿石中提取纯铜的最佳方法是使用一项需要消耗大量电能的工艺，尤其是当矿石中铜含量低的时候。